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K+ is the most abundant cation in plant cells and plays an important role in many ways.K+ uptake of plant has respect to its salt resistant capacity.There are two categories of channel transportation for plants to uptake K+,one is through K+ channels and the other is through nonselective cation channels(NSCCs).The transmembrane localization of K+ may change membrane potential(MP).In this paper,three wheat varieties with different salt tolerance were selected and the MP was measured by microelectrode during K+ uptake.The results showed that the effects of K+ uptake on MP through K+ channels or NSCCs were distinct.K+ influx through K+ channels led to MP hyperpolarization,while K+ influx through NSCCs resulted in depolarization.Diverse MP alteration of wheat varieties with different salt tolerance was mainly due to NSCCs-mediated K+ uptake.Compared with the salt-tolerant wheat,the MP hyperpolarization during K+ uptake of saltsensitive wheat was much more evident,probably because of the cation outflux through NSCCs during this process.
K + is the most abundant cation in plant cells and plays an important role in many ways. K + uptake of plant has respect to its salt resistant capacity. There are two categories of channel transportation for plants to uptake K +, one is through K + channels and the other is through nonselective cation channels (NSCCs). The transmembrane localization of K + may change membrane potential (MP). In this paper, three wheat varieties with different salt tolerance were selected and the MP was measured by microelectrode during K + uptake. that the effects of K + uptake on MP through K + channels or NSCCs were distinct. K + influx through K + channels led to MP hyperpolarization, while K + influx through NSCCs resulted in depolarization. Diverse MP alteration of wheat varieties with different salt tolerance was mainly due to NSCCs -mediated K + uptake .Compared with the salt-tolerant wheat, the MP hyperpolarization during K + uptake of saltsensitive wheat was much more evident, probably because of the ca tion outflux through NSCCs during this process.